etter



Aug. 10, 1948. H. 1 ETTER 2,446,748

PUMP

File'd Aug. 22, 1945 ywx; 1. E11 2 I I y 2a' J/ l.: J7 4 f l f4 4 I 56' Z ,Qa

U71 a if /9 I: 'I l Il i: .0' J5 hi@ 'Il Si? u i 1| l A; /5 929 C Il 'I i J7 '3:5546 I nventor /7 i /4 HnyL EG Y f "I l I A Bf Q Attorneys Patented Aug. 10,Y 1948 NITED STATES PATIENT OFFICE PUMP Henry L..Etter, Lemasters, Pa.

Application August 22, 1945, SerialNa 611,953

3 Claims.

This invention relates to a pump and more particularly to a pump adapted to maintain a substantially constant flow of iluid from a source to a point of discharge.

The primary object of the invention is to insure a constant and continuous flow of fluid without interruption or impulse as is commonly experienced with pumps of the reciprocal type now in common use.

Another object of the invention is a pump of the reciprocal type which may be hand operated or driven from other suitable means and which will deliver a constant stream of fluid from its discharge end.

The above and other objects may be attained by employing this invention which embodies among its features a pump cylinder system having a plurality of cylinders arranged in series, piston means operably associated with the cylinders simultaneously to i'lll one of the cylinders while emptying another, and valves automatically to maintain the system fluid lled.

In the drawings:

Figure 1 is a longitudinal sectional view through a pump embodying the features of this invention,

Figure 2 is a fragmentary sectional view through the lower end of the intermediate or reciprocating cylinder,

Figure 3 is a transverse sectional view taken substantially on the line 3--3 of Figure 1, and

Figure 4 is a transverse sectional View taken substantially on the line 4-4 of Figure 1.

Referring to the drawings in detail, a pipe I leading from a well is screw threaded at its upper end and has fitted thereon a socket Il forming the lower end of the pump designated generally I2.

The pump I2 comprises a cylinder I3, the lower end of which is closed by a head I4 upon which the collar is formed, and arranged axially in the head I4 is a passage I5 through which communication is established between the pipe I0 and the cylinder I3.. Pivotally mounted, as at I6, in a position to normally close the passage I5 is a valve I1 which is adapted to swing into open position as suggested by the dotted lines in Figure 1 when the cylinder I3 is being lled.

Attached to the end of the cylinder I3 opposite the head I4 is a cage I8 having longitudinal slots I9 arranged at spaced intervals around its periphery.

Carried on the end of the cage I8 opposite that which is attached to the cylinder I3 is a flow chamber 20 the lower end of which is closed by a head 2| carrying a packing gland 22 which surrounds a centralopening 23 which is concentric about the longitudinal axis of the chamber 26. Thev end .ofthe vchamber .20 opposite that closed by the head .2|f is provided With a cap 24 formed witha passage which aligns axially with the opening 23 .and is surrounded by a socket 25 to which a discharge pipe 26is connected.

Mounted. for. sliding movement through the opening 23 and packing gland 22 is a hollow piston rod .21' of 'elongated tubular .form which has an external cross sectional area substantially equal to one half of the interior cross sectional area of the cylinder I3 previously referred to. The lower end of the piston rod 21 is screw threaded .to receive a socket V26 .carrying ahead 23 which is formedwithanzopening 3D. This opening 3l! is adapted to be closed by a valve 3| which is pivoted, as. at 3.2, so that when the piston rod 21 is moved in one direction, thevalve will be moved to open positionas suggested by the dotted lines in Figure 2,. but when lthe rod is moved in the opposite direction, the valve 3| will seat -on the head 23 to close the passage 30. As shown, the head 29 is provided .withan outstanding annular flange 33 of a diameter loosely to i'lt within the interior oi the cylinder lI3. This ilange carries pump leathers 34 and 35 on opposite `sides thereof in order to establish ya tight connection between the Wall of the cylinder I3 and the piston formed by the head 29, flange 33., and leathers 31| and 35.

Attached to the upper end of the piston rod 21 is a spider 36 carrying a socket 31 for the reception of the lower end of the pump-actuating rod 38 which enters the pump through the discharge pipe 26 as will be readily understood upon reference to Figure 1.

The operation of the pump is as follows: Upon the upstroke of the piston resulting from the elevation of the piston rod 21 by means of the pump rod 38, the valve I1 will be opened so as to cause fluid to flow through the pipe Ill into the cylinder I3 iilling the same. Upon reversing the motion of the piston rod 21, the pressure of the uid on the underside of the valve 3| will cause the same to open and the contents of the cylinder I3 will be forced into hollow interior of the piston rod 21. Upon reversing the motion of the rod 21, i. e., again advancing the piston into the cylinder I3, the fluid drawn into the cylinder I3 will cause the uid contained in the hollow interior of the piston rod 21 to overow the top so as to fill the flow chamber 26. Upon repeating the cycle, fluid will again be drawn into the cylinder I3 while that in the piston rod 21 is being elevated, thus causing a large portion of the fluid contained in the flow chamber 20 to be displaced and forced out of the discharge pipe 26. Upon reversing the motion of the piston rod 21 after completing its upstroke, the uid contained in the cylinder I3 will again be displaced into the interior thereof with the result that the fluid already therein will be forced out over the top during the downstroke and continue the displacement of fluid from the ow chamber 2|] so that a constant flow through the pipe 26 is maintained irrespective of the direction of motion of the piston rod 21 and the piston carried thereby.

It will thus be seen that the hollow piston rod 21 reciprocating in the cylinder 20 acts as a plunger in the flow chamber 20 which serves to displace the uid confined therein with each stroke of the piston with the result that'the flow j 5 chamber and the upper end of the piston rod l 2l serve as a double acting pump operating'iri conjunction with a single acting pump embodying the cylinder I3 and the piston Working therein.

It is obvious that this pump will satisfactorily perform its functions whether submerged or not.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that minor changes in the details of construction and combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention .as claimed.

What is claimed is:

l. In a constant flow pump, a pump cylinder system comprising a pair of spaced axially aligned cylinders of equal capacity, a cylinder reciprocable through adjacent ends of the spaced cylinders, said reciprocable cylinder having a capacity equal to that of one of the spaced cylinders, a piston carried at one end of the reciprocable cylinder, said piston cooperating with one of the spaced cylinders simultaneously to ll it While the reciprocable cylinder empties the other spaced cylinder, and valves arranged in the system automatically to maintain the system fluid filled.

2. In a constant flow pump, a pump cylinder system comprising a pair of spaced axially aligned cylinders of equal capacity, a cylinder reciprocable through adjacent ends of the spaced cylinders, said reciprocable cylinder having a capacity equal to that of one of the spaced cylinders, a piston carried at one end of the reciprocable cylinder, said piston cooperating with one of the spaced cylinders simultaneously to -empty it while iilling the reciprocable cylinder, a valve in reciprocable cylinder adjacent the piston and |a valve in the cylinder in which the piston operates, said valves cooperating to maintain the system fluid lled.

3. In a constant flow pump, a pump cylinder system comprising a pair of spaced axially aligned cylinders of equal capacity, a cylinder reciprocable through adjacent ends of the spaced cylinders, said reciprocable cylinder having a capacity equal to that 'of one of the spaced cylinders, one of the .spaced cylinders having an inlet port in its end remote from the other spaced cylinder, the other spacd' cylinder having a discharge port in its end remote from the cylinder having the inlet port, a piston on and reciprocable with the reciprocable cylinder for cooperation with the cyl-y inder having the inlet port so that when the reciprocable cylinder is moved away from the inlet port the cylinder having the inlet port will become fluid lled, a valve to close the inlet port and trap fluid therein as the piston is advanced toward the inlet port, the reciprocable cylinder having a port opening thereinto at the end carrying the piston through which uid trapped in the spaced cylinder having the intake port enters the reciprocable cylinder and a valve for closing the port in the reciprocable cylinder for trapping iluid in-troduced thereinto through the port therein.

HENRY L. ETTER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 23,849 Lloyd May 3, 1859 130,6 47 Lockling Aug. 20, 1872 184,603 Farras Nov. 2l, 1876 940,192 Rexroth Nov. 16, 1909 1,170,139 Briau Feb. 1, 1916 

